Light-Emitting Substrate Timing Control for Staggered Writing
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Solution Overview
Problem
The simultaneous writing of light-emitting data signals to different light-emitting unit groups due to sudden changes in display frequency causes mischarging and abnormal brightness in display apparatuses, particularly in those supporting Free Sync technology.
Innovation Solution
A driving method and apparatus for a light-emitting substrate that includes generating a frequency modulation synchronization signal and an auxiliary synchronization signal to stagger the writing phases of light-emitting unit groups, ensuring that light-emitting data signals are provided sequentially, even with frequency variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If display frequency is suddenly changed to adapt to different display requirements, then adaptability is improved, but writing phase synchronization deteriorates causing mischarging and abnormal brightness
Solution Approach 1:
The patent introduces an auxiliary synchronization signal that is generated in advance based on the frequency modulation synchronization signal. This auxiliary signal preliminarily adjusts the writing phase of light-emitting unit groups before the actual frequency change occurs, ensuring that the writing phases remain staggered and preventing mischarging even when display frequency is suddenly changed.
Solution Approach 2:
The auxiliary synchronization signal acts as an intermediary between the frequency modulation synchronization signal and the writing control signals. It mediates the transition by providing an intermediate control mechanism that adjusts writing phases progressively, avoiding direct conflicts that would cause mischarging and abnormal brightness during frequency transitions.
2Reliability
If writing phases of light-emitting unit groups are staggered to prevent mischarging, then reliability is improved, but writing time duration increases
Solution Approach 1:
The patent employs periodic auxiliary synchronization signals that are generated at specific intervals based on the frequency modulation synchronization signal. These periodic signals create regular staggered writing phases across different light-emitting unit groups, ensuring reliable sequential writing while maintaining a predictable and optimized writing schedule that minimizes total writing time.
Solution Approach 2:
The writing phases are dynamically adjusted using the auxiliary synchronization signal that adapts to the actual operating conditions and frequency changes. This dynamic control allows the system to optimize the staggered writing schedule in real-time, preventing mischarging while minimizing the overall writing time duration through adaptive phase shifting.
Data Source
AI summary
A driving method includes: receiving a frequency modulation signal; generating a frequency modulation synchronization signal; generating an auxiliary synchronization signal when a rising edge of the frequency modulation synchronization signal is in a writing phase of a light-emitting unit group to which light-emitting data signals are last written in a previous frame period; and controlling, based on the auxiliary synchronization signal, a writing phase of a light-emitting unit group to which light-emitting data signals are to be first written in a current frame period to be staggered with the writing phase of the light-emitting unit group to which light-emitting data signals are last written in the previous frame period. The light-emitting unit group to which light-emitting data signals are last written in the previous frame period belongs to same cluster as the light-emitting unit group to which light-emitting data signals are to be first written in the current frame period.